Plate Definition and 1000 Threads

I uploaded the problem statement and the answer in the solution manual. I think the manual is wrong for Q2 which should've been (200V)kC2 not 200VkC1, right?

Homework Statement Use equations x_{cm}=\frac{1}{M}\int x dm and y_{cm}=\frac{1}{M}\int y dm to calculate the x- and y-coordinates of the center of mass of a semicircular metal plate with uniform density \rho and thickness t. Let the radius of the plate be R. The mass of the plate is thus...

Homework Statement See figure attached for problem statement, as well the solution. Homework Equations The Attempt at a Solution I'm confused as to how he is writing these equations from the boundary conditions. What I understand as the boundary condition for D is, \hat{n}...

Homework Statement If one were to consider a parallel plate capacitor with a distance d between them connected to a battery and a vacuum space between the plates. Will the integral form of Gauss' Law to any closed surface between the plates that does not cross either plate hold? If not, what...

Before I begin I would like to say hello to everyone. This is my first post. I will follow and abide by all rules here. Homework Statement A rectangular plate measuring 2m by 5m is suspended vertically in a liquid with density 500 kg per cubic meter in such a way that one of its longer sides is...

Hi everyone, I've been reading quite a few papers on the study of sound radiation, and a common system that is studied is described as a "baffled plate". What exactly are the boundary conditions on a baffled plate? I thought it was simply that the edges have a pinned boundary condition, i.e...

I went to see an orthopedic specialist this year, when I was 15 years and 5 months old. I am 5 ft, 11 1/4 in. The specialist looked at my then-recent X-rays and I was not even halfway done growing. (I'm pretty sure I scored a 2 out of 5.) I am due for another X-ray sometime next year, at...

A flat, circular plate (mass Mp, radius Rp, thickness Tp) rotates parallel to the surface of the Earth on a frictionless axle. As it spins, a point on the top of the disc traces a circle each time the plate completes a rotation. in terms of the number of rotations per minute (N/min), create...

Homework Statement Find the centre of mass of the 2-dimensional plate which occupies the region inside the circle x^2+y^2=2x, but outside x^2+y^2=1, and for which the density is proportional to its distance from the origin. Homework Equations Centre of mass for x coordinate: 1/m ∫∫ x ρ(x,y)...

a certain bifringement material has indexes of refraction n1 and n2 for the two perpendicular components of linearly polarized light passing through it. the corresponding wavelengths are λ1=λ0/n1 and λ2=λ0/n2, where λ0 is wavelength in vacuum. If crystal is to function as a quarter-wave plate...

Homework Statement show that minimum thickness of quarter wave plate is d=\lambda0/4(n1-n2 Homework Equations \lambda1=\lambda0/n1 \lambda2=\lambda0/n2 The Attempt at a Solution for quater wave plates wavelengths must differ by 1/4 i can see its simple but i just can't see what...

Electric plate has three sections with equal resistivity. Those resistivities combined parallel - water boils per 6 minutes. How much time it will take to boil the same weight and same initial temperature of the water if we will combine resistivities sections like in A and C Thanks very much

Homework Statement The negative plate of a charged, isolated parallel plate capacitor with a vacuum gap of width d and carrying a surface charge density s is uniformly irradiated with a short pulse of ultraviolet light whose photon energy is just enough to release a photoelectron at the...

Dear all, I think I have an easy problem for you, however I get confused by the simplicity and complexity at the same time. Situation is like this: I have a point charge at a distance d from an infinite plate with thickness comparable to the distance d. Is there difference between the...

Homework Statement In this flat plate heat exchanger, rippled plates (0.3 m thick each) create channels that allow heat transfer between a hot and a cold fluid. Conduction occurs then from the heat temperature difference between the two fluids while convection occurs as the fluids move...

I guess point A is the origin of my stationary axis, with Y going up along AB, then X going along AC. My moving axes would be at the center of the moving disk at point C. So, the w of the small disk is induced by the Ω of the main shaft along AB. If the radius of the small wheel is r, then...

Homework Statement Consider an infinite thin flat plate with a 1m chord at an angle of attack of 10 degrees in a super sonic flow. Describe the angle theta between the Lift and Normal Force, is it the same as the Drag and Axial? Homework Equations L=Ncos(a)-Asin(a) D=Nsin(a)+Acos(a)...

Problem: Two square metal plates are placed parallel to each other, separated by a distance d= 1.56 cm. The plates have sides of length L = 0.560 m. One of the plates has charge Q= + 1.74×10-6 C, while the other plate has charge -Q. Calculate the magnitude of the electric field between the...

Homework Statement The mass of the homogeneous flat plate is 50 kg. Determine the reactions at the supports A and B. I've attached the diagram. The Attempt at a Solution I know I will need to find the center of mass. I don't remember exactly how to do it, but I found the centroid...

Homework Statement I attached the drawing. The force of magnitude F acts along the edge of the triangular plate. Determine the moment of F about point O. Homework Equations M=rxF The Attempt at a Solution What I did was I just picked the top left point of the triangle and labeled...

Hiii heeeeeelp please. I am new here and hope to find a solution and an easy to understand explanation to my problem:confused:. Thank you all :smile: a. A specimen corresponding to a finite plate of width W = 65 mm is made from a steel with a yield strength of 650 MN m^-2 and contains an edge...

A metal plate is connected by a conductor to a ground through a switch. The switch is initially closed. A charge of +Q is brought close to the plate without touching it, and then the switch is opened. After the switch is opened, the charge +Q is removed. What is the charge on the plate then...

Hello all, I'd like to check my work on this to make sure a safe lift is done. We have an 11m diameter, 35mm thick, 26mT circular steel plate to which we will add two trunions at the ends. The circular plate is welded in 4 parts and once we weld one side we have to flip to weld the other. That...

Hey, We can observe the build up of photons on a photographic plate, but we can't observe this build up with our bare eyes. i.e. without needing a photographic plate - just by looking like how we look right now. how come?

Lets assume that there is a parallel plate capacitor connected across a supply of V volts. Then, there is charge redistribution between the plates such that finally the potential of positive plate wrt the negative plate is V volts. Let us assume air is the dielectric between the two plates. Now...

1. Homework Statement PLEASE DO NOT DELETE THIS POST, MODS, IT MAY LOOK LIKE THE SAME QUESTION AS BEFORE, BUT IT IS NOT, IT IS A TOTALLY DIFFERENT PART TO THE QUESTION. consider a parallel=plate capacitor with square plates of side L and distance d (<<L) between them, charged with charges...

Hi, I'm trying to carryout some analysis of flat plates subjected to hydrostatic water pressures however the plate material is HDPE. The problem I'm having is that all the formulae on the web and in Roark's 7th Edition are typical of steel with a Poisson's ratio of 0.3. I can't therefore...

HHi all, I'm working on spiral/plate heat exchanger design and the temperature difference is to be 400c. I need some one to guide me through it. Thanks

Homework Statement Find the E field of a parallel plate capacitor tilted at 45 degrees from vertical and moving at a speed v. each plate has plus or minus \sigma_0 for charge density. The Attempt at a Solution Well the E field in rest frame would be E= \frac{\sigma_0}{\epsilon_0}...

Hey Everybody! I am getting a vanity plate and I want it to be NERDY! I'm thinking about something along the lines of math, computer science, or electricity (especially lighting). Must be 7 characters, numbers and/or letters. Some ideas I have: SUDO GO, FF0000, 186KKMS .... Got any...

Hey, I've recently been taking a look at the theory of plate vibration, but I can't seem to find anywhere an exact definition of what consitutes a "clamped" and a "simply supported" plate. What exactly are these, conceptually and mathematically?

I'm not sure whether to put this in Earth or Astrophysics. How far would these sound vibrations/waves travel? Do they just stay within the Earth, or is it possible for them to travel through space; and if so, how or why or is it possible for these vibrations to attract asteroids?

Homework Statement 2 part problem. I've already solved the first part. Two parallel plates are held at potentials of +380.0 V and -150.0 V. The plates are separated by 3.00 cm. a. Find the electric field between the plates. b. An electron is initially placed halfway between the...

Dynamic pressure, from Bernoulli's principle, for a moving fluid with a given density is P = \frac{1}{2}\rho {v^2} On the other hand, we can compute the force on a plate hit by that fluid from the rate of momentum transfer. Assuming that the fluid exits sideways after impact, we have...

I've been thinking about this for a while, and I think people of PF will be able to answer it haha In parallel plate capacitor, we charge the capacitor by connecting a power supply/battery. Then, after few minutes, the capacitor is fully charged with different signs, + and -. With that...

We have a situation where we have air in front of the dry pigs and need to control the pig speed Medium is air, pressure is 17 barg upstream and 0.2 barg downstream and pig speed target is O.5 m/s for the pig in the 48" pipeline with a pressure of 17 barg. need to find the following...

The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 × 10-3 m2, and the spacing between the plates is 6 × 10-3 m. There is...

Hi all, I have a cantilever that is a plate (not a beam) with dimensions 2mm wide x 4mm long x 0.3mm thick. It is fixed only at one side, with the other 3 sides free. I want to be able to find the intrinsic stress on it after it is fabricated. To complicate matters, I also want to put...

Hello, I need some help in a matter. I don´t have any great knowledge in thermodynamics. If I have a plate of stainless steel (2mm thick). On one of the sides of the plate the temperature is 400C. I need to have a "simple" derivated calculation regarding how much the temperature is on...

Hi, I am trying to obtain a relation for calculating the deflection of a parabolic plate of thickness (say 't') clamped at one end, with a concentrated load along the center line at the "apex" end. Any direct links for the formula? Thanks!

hi.. This is abdul I am carrying a impact of sphere on a composite laminated plate. i wanted to calculate the contact force when sphere impacts the plate.. or can anyone help me how to get the stiffness of plate.. or deflections in plate.. with respect to time Thanking you Your help will...

Homework Statement A circular jet of water of radius r1 is propelled vertically downwards and hits a circular plate of radius r2 (> r1 ) so that the centre of the jet is incident onto the centre of the plate. The velocity of the jet as it hits the plate is v and is normal to the plate...

When did plate tectonics begin? The early Archean was essentially shallow seas, salty water early on from rifting, shield volcanoes (no sticky silicates, since no oxygen) etc. There were no deep oceans, no mountain building, no continents, since there was no plate tectonics. One could still have...

1. You have fabricated a parallel plate capacitor in your work shop, but the square metal plates end up not being exactly parallel to each other. They form an angle \alpha. The plates, size L, are held at constant electrical potentials, V1 and V2, corresponding to an electrical potential...

Suppose there is a plate with area A, on which jet of air with velocity 'v' is striking, then force on it will be = (density) * A* v^2 But if we go by basics i.e. F = d(mv)/dt = v d(m)/dt + m d(v)/ dt here i am not able to figure out that why the second term i.e. m d(v)/ dt is zero...

Homework Statement A half wave plate and a quarter wave plate are placed between a Polariser and an analyser .All of these are parallel to each other and perpendicular to the direction of propagation of unpolarised incident light.The optic-axis of the half-wave plate makes an angle 300 with...

Shear stress of bolts Diameter of bolt Shear stress of plate Load carried Bearing stress of plate Bearing stress of bolts If someone could help me it would be fantastic Thanks

soo as the title says, i need formula for force acting on a plate that is moving trough fluid, in my case air... need it for rocket simulation because of its flat stabilizers... i thought like this: a flat plate is moving in any direction (yeah that complicates things... but keep it...

Homework Statement Two circular disks spaced 0.50 mm apart from a parallel-plate capacitor. Transferring 1.90 x 10^9 electrons from one disk to the other causes the electric field strength to be 1.90 x 10^5 N/C. What are the diameters of the disks (in cm)? Homework Equations E = Q /...

Hi! I've got a problem with this: Count moment of inertia for rectangular plate a x b, if you know that moment of inertia of thin rod is \frac{1}{12}ml^2 . Do not use integrals!, others mathematical functions required (I can proof this moment by integrals, but this is not issue). I know that...